Tripath TA2024/20 Bridge/Parallel Config - Page 2 - diyAudio
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Old 4th November 2005, 10:31 AM   #11
Pano is offline Pano  United States
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Intersting board, John. What is it out of? A HT in a Box?
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Old 4th November 2005, 12:06 PM   #12
john65b is offline john65b  United States
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Aloha Panomaniiac...

Nope, they came out of Video Game Kiosk. Actually, they were R&D fabs. Don't know if it ever flew or not. Got a bunch of them and a few 6 ch boards have inoperable channel/channels.

Put up a few for sale on Audiogon.

Preliminary tests confirm they put out more power than the TA2024 (duh), but lack some of the magic of the TA2024. We are still putzing with some of the power supplies (12 V 7Ah battery currently) and components (input/output caps to start) to see if we can regain that better soundstage and imaging from the TA2024.

From what I read, you have some profound knowledge/experience with these boards, any pointers? The SMD components on these bords seem to be laid out exactly like the schematic for the Tripath TA2020 datesheet, except they seem to have component values 10x bigger (ie 10 mH and the board has 100 mH inductors) - maybe 'cause of the six outputs sucking off the same power rails?

Anyway, your input is welcomed.

Rich - are you getting this?

BTW, transferred to Kapolei on Oahu in 1999 for work and lived there for 3.5 years... currently live in Utah...miss the beaches, Girls in skimpy bikinis, SCUBA Dives, Girls in skimpy bikinis, Kona beer and Volleyball on the beach, and yes, Spam Misubies (mainlanders will never understand the innate Hawaiian love of Spam - yum). Did I mention Girls in skimpy bikinis?

Mahalo
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Old 4th November 2005, 02:37 PM   #13
BWRX is offline BWRX  United States
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Default Re: Will re-try

Quote:
Originally posted by john65b
BWRX --> You said four resistors in your previous post, and from the LM3886 datahseet outlining the parallel mode, you only need to put the four resistors on the four positive outputs and the neg outputs go to ground resistorless ...
I said 4 because I thought you'd only be testing one channel instead of a stereo setup. The LM3886 only need resistors on one output because they have single ended outputs. These Tripath chips need resistors on both outputs because they're bridged - the negative output is not grounded. This is just another example of how much punishment the chips can take!
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Old 4th November 2005, 03:16 PM   #14
john65b is offline john65b  United States
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Whoops, my bad.

I will re-try tonight. I can always put these resistors at the speaker to make the wiring eaiser - no soldering at the board outputs, but double the wires.

If this arrangement works and sounds good, I will investigate paralleling my XR50 Panny outputs (party mode and reversed channels) to my Maggies to see if I can get 175wpc of pure digitally amplified love to them.

Whooo hooo...
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Old 5th November 2005, 03:39 AM   #15
john65b is offline john65b  United States
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After having all eight resistors on the outputs, the sound was a bit better, but I firmly believe my linear power supply is insufficient for these four channels.

I have two TA2024 amps and I will try them tomorrow, since power requirements would not be an issue here...

So far, so good.
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Old 5th November 2005, 11:19 PM   #16
Pano is offline Pano  United States
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Quote:
Originally posted by john65b
From what I read, you have some profound knowledge/experience with these board
Uh, well - yeah, I guess I do.
Everyone needs a hobby, right?

Quote:
they seem to have component values 10x bigger (ie 10 mH and the board has 100 mH inductors)
If they do, there is something very wrong. That would bring the filter -3dB point down by 10X, not a good thing. BTW, it's 10uH MICRO Henries, not milli. That would make a huge difference, too!

Yep, that's Hawaii, girls in bikinis, spam and coconuts. Gotta love it, brah!
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Old 6th November 2005, 06:06 PM   #17
john65b is offline john65b  United States
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As some else also replied, your must likely correct, these, the component values have to be correct...I must be getting my mili/micro mixed up...

Briefly tried the two Sonic Impact TA2024 boards paralleled, same difference. muddy, and incoherent. I may try again with a 1 ohm resistor on each output to see if that makes any diference...

more later
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Old 15th May 2014, 03:08 PM   #18
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Quote:
Originally Posted by john65b View Post
Well, got all the soldering done and ran the TA202's in parallel. It didn't blow up. It did sound a bit louder...20 wpc to perhaps a 35 wpc??

I just tried this last night and No. It doesn't work at all. You did not see any more power. The scope was floating and seeing the full output range into an 8 ohm resistor (2-16 ohms in parallel to handle the power). Stock supply was 13v, the bridged outputs generated a signal that swings about 20 volts (+10v from one half and -10v) from the other half..

RMS Power at 1Khz with the Stock Lepai LP2020+ with included adapter generates about 19.6v before distorting. Paralleling up the two outputs did nothing to the waveform.

I repeated the tests with a speaker and it was no different than the resistor.

The other thing I found was that you can only get about 19.6 pk-pk output = 6.93v RMS = 6.0Watts RMS into 8Ohms at ~1% distortion. This works great as computer speakers, but kinda sucks for my band gig rig..
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